Reverse sublist between equal-value nodes

Q: Reverse sublist between equal-value nodes

This question evaluates linked-list manipulation and pointer-management skills, focusing on reversing an in-place sublist between two nodes with equal values while respecting O(n) time and O(1) extra space constraints.

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Question

Given the head of a singly linked list and a target value v that appears at least twice, reverse the sublist starting at the first node with value v and ending at the second node with value v (inclusive). If v appears fewer than two times, return the original list. Provide an in-place O(n) time, O(

extra space solution and discuss edge cases (adjacent boundaries, when the sublist includes the head or tail).

Reverse sublist between equal-value nodes

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